Segment and Geographic Information (Geographic Information for Sales to External Customers and Long-lived Assets) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 1,883	$ 2,066	$ 2,144	$ 2,025	$ 1,995	$ 2,255	$ 2,235	$ 2,150	$ 8,118	$ 8,635	$ 8,041
Long-lived assets	6,912				6,595				6,912	6,595
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									5,530	6,114	5,739
Long-lived assets	6,012				5,829				6,012	5,829
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									573	649	653
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									478	500	432
Long-lived assets	588				528				588	528
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									175	155	104
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									119	105	96
TAIWAN, PROVINCE OF CHINA
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									84	102	96
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									1,159	1,010	$ 921
Long-lived assets	$ 312				$ 238				$ 312	$ 238